Feed collet



April 2, 1929. J. c3. BUTRICK FEED GOLLET Filed Feb. 25, 1928 TTORNEYX R mm m V u m5 0 6 6 W J,

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Patented Apr. 2, 1929 UNITED STATES JAMES O. BUTRICK, OF MUSKEGON, MICHIGAN.

FEED COLLET.

Application filed February 23, 1928. Serial No. 256,346.

This invention relates to feed collets such as are commonly used with automatic screw 1nachines, the purpose oi which is to grip, guide and feed the work forward to the tools which operate thereon.

it is an object and purpose of the present invention to provide a feed collet which will :lrictionally grip the work completely to the outer end of the collet so, that there is no waste of material, but all of the material which is being fed by the collet is completely worked up without any short length thereoif being wasted; also, to provide unimproved adjustable means for such a feed collet.

Various other objects and purposes than those stated will be apparent as an under standing of the invention is had from the following description taken in connection with the accon'ipanying drawings, in which F 1 is a side elevation of the collet of my invention.

Fig. 2 is a longitudinal central section therethrou gh Figs. 3 and 4 are transverse sections taken, respectively, on the planes of lines 33 and 4e-4: of Fig. 2.

Fig. 5 is an end elevation of said collet.

Like reference characters refer to like parts in the different figures of the drawings.

In the construction of the collet, a length ct material of cylindrical shape is provided, one end portion or section 1 thereof having a rod uced threaded extension 2 and at one end a cylindrical opening 3, bored longitudinally through said extension and through the sec tion 1 nearly to the inner end thereof. The threaded part 2 provides means for attaching the collet to the operating member therefor.

In longitudinal alignment with the section 1 is an integral section t having a reduced outside diameter, connected integrally with. which is a collar 5 of substantially the same di-an'ieter as the section 1 though it may be slightly larger and around which a ring groove 6 is made.

The intermediate section 4 and the adjaccnt end portions oi. the section 1 and the collar 5 are longitudinally slotted at a plurality of spaced-apart points, as indicated at 7, and are additionally slotted diametrically opposed to make the slots 8. The slots 8 extend entirely through to the outer end of the collar 5 While the slots 7 terminate at their outer ends a short distance inward from the outer ends of the collar 5.

i A split ring 9 of spring material is seated in the groove (5 in collar 5 and its tension acts Q to lorce the two halves oi the collar at opposite sides oi. the slot 8 toward each other.

shown and two slots 8, it evident ring 9 which causes the two opposed jaws of the collar to grip the work with considerable forcdl' Any wear which may take place in the opening through the intermediate section l is readily corrected by forcing the various parts between the slots 7 and 8 inward by suitable operations. For instance, the same may be struck with a hammer between the slots at the shoulder between the ends of the two see tions 1 and 4, thereby decreasing the cross section area of the opening 10 an amount sutiicient to compensate for any wear which occurs.

In the manufacture of this device I produce the same from a solid rod or bar. I bore out the hole at the center and screw thread the inner end and counterbore the same. I then turn down the reduced section at i: and the recess in the spring collar 5). li hen this done, I cut the :.-:l ts 8, leaving the end complete, and I then cut the slot "i". it then temper or harden the entire collct and thereafter draw the temper of the solid end portion by immersing itin hot lead up to about the point where the section line -l--@l crosses Fig. 2, observing the color and noting the drawing of the temper at the section 4 until it is about half way, and it is quenched while the color indicates that the shoulders between the section 4 and the part 1 are still hard. so that they may be deflected inwardly tor the purposes of adjustment. hen. this is done, I slit the end of the slot 8 by a slitting grinder.

The spring ring 9 is of such dimension as to hold the parts in closed position when they are worn out, and the spring is open at the side as indicated, the spring being the governing means for holding the end jaws yielding-1y in position and supplementing the elastic of slots 7 may be varied. In

The heavier parts are thus annealed strips at the section 4. When in use the rod- WGQIS the inner section until fails to operate properly, the same is ad usted for such 7 Wear by placing the collet on an anvil and the spring, there'bein striking a sharp blow With a peening hammer on each one of the sections between theslits ple but very effective for the purposes for which; it is designed. I have illustrated a practical embodimentof my invention. The

invention is not restricted thereto but is to be considered comprehensive of all forms of structure coming within their scope of the claims which define t re invention.

I- claim:

I l. A device'of theclass described, comprising an elongated cylindrical body, screw threaded at one end and with an axial bore therethrough with" externally reduced diam- ,ete'rportion towards the opposite end forming a projecting collar, and-an annular groove seat in said collar, said body beingcircu-m ferentiall-y centrally split through said collar and said reduced portion into the-full size part toform deflecta-ble clamping halves, and the halves being intermediately longitudinally slotted through the said reduced por tion and into the full body part to form flexible compression spring clamp; means, and a split ring eoinpressordisposed in the annular groove te force the oppositesides thereof yieldingly'together toclbsethe sameyieldingly and cause said reduced portion to yield-'- ingly-cnga ge the worlgthe said body being tempered and hardened and then the body portion and heavy part of the compression strips having the temper drawn and the parts thus annealed, whereby the structure is adjustable to wear by forcibly deflecting the annealed portion of said strips inwardly, as specified.

2; A feed collet comprising an elongated tubular body circumferentially closed and screw threaded at one end, the in erior of said body being reduced in diameter a considerable partof its length extending inward from the end opposite the screw thread to provide relatively long; gripping, surfaces, said body also being provided with a plurality of longitudinal slots extending entirely through said gripping surfaces, one or more of said slots extendin through the end ooposite the screw tlll'Oilt d end, the exti-n'ior of said body having a reduced portion and located wholly over said interior reduced portion and spaced from the slotted end and a contracting member applied to the exterior surface of the body surrounding the grip ping surface near the slotted end.

3; A feed collet comprising an elongated tubular body circumferentially closed and screw threaded at one end, the interior of said body being reduced in diameter a coin siderable part of its length extending inward from the end opposite the screw thread to provide relatively long gripping surfaces, said body also being provided with a pinrality of longitudinal slots extending entirely through" said gripping surfaces, with a plurality of said slots extending through the end opposite the screw threaded end", the exterior of said body having a reduced portion and located wholly over said interior reduced portion and spaced from the slotted end and a contracting member applied to the exterior surface of the body surrounding the gripping surface near the slotted end.

In witness whereof I have hereunto set my hand.

JAM-ES O BUT RTCK 

